log.go

package sladder

import (
	"io/ioutil"
	"log"
)

type discardLogger struct {
	*log.Logger
}

func (l *discardLogger) Warn(v ...interface{})                  {}
func (l *discardLogger) Warnf(format string, v ...interface{})  {}
func (l *discardLogger) Fatal(v ...interface{})                 {}
func (l *discardLogger) Fatalf(format string, v ...interface{}) {}
func (l *discardLogger) Error(v ...interface{})                 {}
func (l *discardLogger) Errorf(format string, v ...interface{}) {}

var (
	// DefaultLogger implements defaule logging behaviours.
	DefaultLogger = &discardLogger{Logger: log.New(ioutil.Discard, "", 0)}
)

// Logger is logging abstraction.
type Logger interface {
	Fatal(v ...interface{})
	Fatalf(format string, v ...interface{})

	Error(v ...interface{})
	Errorf(format string, v ...interface{})

	Panic(v ...interface{})
	Panicf(format string, v ...interface{})

	Print(v ...interface{})
	Printf(format string, v ...interface{})

	Warn(v ...interface{})
	Warnf(format string, v ...interface{})
}